On Sat, 21 Nov 2009, g_remlin wrote:
> Hi Barry, thanks for taking the time to reply (my previous more informative
Happy to have helped, even though I didn't help.
> This is the Terrestrial transmission standard being rolled out across the UK,
Ah. I assumed `CH' referred to the country, and the FEC of 1/2
being that used for a robust yet low-bandwidth signal.
Actually, there are a couple steps to the DSO in the UK, with the
introduction in less than two weeks of the DVB-T2 standard at a
few places, to allow HD broadcasts with some 36 or so Mbit/sec.
This introduction will be taking place without any consumer
equipment until next year, and cannot be received by existing
hardware, as has been asked a few times on these lists. In
the areas where this happens (apart from places like Crystal
Palace) this is happening by converting one multiplex from
DVB-T to -T2.
You probably are referring to the other part of DSO, which has
meant the conversion from 2k to 8k transmission mode, and the
use of 64QAM modulation.
> I live in one of the first areas to be upgraded to the new standard. Since the
> change, my DVB-T PCI card will no longer tune (despite the signal level being
Once again I'll point out what in your Subject: is likely wrong,
as these are not the values I know to be used in the UK:
``Subject : Re: CH???, Bandwidth 8MHz, Fec_Hi 1/2, Modulation QAM64, Mode 8K,
Guard 1/4, fails to tune\demux''
First off, the 1/2 FEC isn't used as that is used for a robust
signal, as one would want from Handy-TV (DVB-H), and in the UK
with its history of over-the-air broadcasting and rooftop aerials
means that 2/3 and 3/4 are what I see listed (although the data
I'm looking at appears to be pre-8k switchover).
Also, the guard interval would not be 1/4 as the UK makes use of
MFN frequencies, and this appears reflected in the value of 1/32
listed in the old data.
You might try to re-scan with the above values corrected, if this
would be a reason why you can't lock onto a signal.
thanks,
barry bouwsma
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
